Bases: astropy.modeling.projections.Pix2SkyProjection, astropy.modeling.projections.Conic
Conic orthomorphic projection - pixel to sky.
Corresponds to the COO projection in FITS WCS.
See Conic for a description of the entire equation.
The projection formulæ are:
C &= \frac{\ln \left( \frac{\cos\theta_2}{\cos\theta_1} \right)} {\ln \left[ \frac{\tan\left(\frac{90^\circ-\theta_2}{2}\right)} {\tan\left(\frac{90^\circ-\theta_1}{2}\right)} \right] } \\ R_\theta &= \psi \left[ \tan \left( \frac{90^\circ - \theta}{2} \right) \right]^C \\ Y_0 &= \psi \left[ \tan \left( \frac{90^\circ - \theta_a}{2} \right) \right]^C
where:
\psi = \frac{180^\circ}{\pi} \frac{\cos \theta} {C\left[\tan\left(\frac{90^\circ-\theta}{2}\right)\right]^C}
Parameters: | sigma : float
delta : float
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Attributes Summary
param_names |
Methods Summary
evaluate(x, y, sigma, delta) |
Attributes Documentation
Methods Documentation